DC830A - Schematic

4
2
D4
Opt.
FG
G2
BOOST
GND
TG
5
3
INP
TS
4
1
Comp
3
2
FB=1.23V
R42
0
2.5Vr
R22
13.3K
R32
294K
R29
22.1K
16
Vin
15
Rosc
Out
14
4
Sync
PGND
13
5
SS/MaxDC
Delay
12
6
Vr=2.5V
OC
11
7
SD/Vsec
Isense
10
8
GND
Blank
9
3
R3
47
D10
Opt.
1
C9
100pF
D6
B0540W
C4
0.1uF
2
CS
D7
B0540W
C8
100pF
Q9
BCX55
2
1
1
R10
1K
D8
B0540W
T2
PE-68386
Pulse Eng.
C7
220pF
CU1
1uF
16V
2
Gnd
TP2
CO5: See Quick Start Guide
R8
2.2
RCS1
0.020
1206
2
Sout
1
6
2
5
3
4
C6
0.22uF
50V
Vu1
R23
910
R24
39K
CG
R12
0
2
C
1
Q14B
5
Sync
Sw1
Vfb
R18
10K
R21
10K
U6
PS2801-1
4
1
3
2
R27
270
Vaux
C14
1uF
10V
Vaux
Sync
R16
10K
R26
100
C23
0.1uF
C13
0.47uF
10V
Q14A
PBSS4140DPN
2
D9
PDZ7.5B
C5
0.22uF
50V
( Install 300 ohm In Place Of CO5 )
Vaux
R17
560
R20
C11
64.9K 0.01uF
U5
LTC3900CS8
1
CS+
SYNC
8
2
CS-
TIMER
7
3
CG
GND
6
4
VCC
FG
5
Vaux
R19
38.3K
1%
2
C12
470pF
R25
0
Q13A
PBSS4140DPN
FG
Q13B
5
B
2
B
R28
442K
R33
158K
R30
1.2K
D11
BAS516
C15
2200pF
250V
R31
10
U4
LT4430ES6
1
1
+Vb
C16
0.22uF
10V
G2
C19
1uF
VCC
2
GND
3
OC
OPTO
6
COMP
5
FB
4
C17
0.015uF
C18
10pF
R34
1.96K
3
G1
Q2
PHM21NQ15T
RCS2
0.020
1206
A
2
Blank
3
Rblank
4
SGND
5
IN
R37
1
C20
Opt.
DrVcc
9
Vin
8
FB
7
EN/Shdn
6
R39
Opt.
Vu2
R38
18.2K
1%
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Customer Notice
R40
57.6K
4
+Vo1
C24
33pF
2.5Vr
R41
332K
Linear Technology Has Made A Best Effort To Design A
Circuit That Meets Customer-Supplied Specifications;
However, It Remains The Customer's Responsibility To
Verify Proper And Reliable Operation In The Actual
Application. Component Substitution And Printed
Circuit Board Layout May Significantly Affect Circuit
Performance Or Reliability. Contact Linear Technology
Applications Engineering For Assistance.
This Circuit Is Proprietary To Linear Technology And
Supplied For Use With Linear Technology Parts.
C22
2.2uF 10V
5
Q15
Opt.
1
10
OUT
GND
CS
PGND
11
G2
1
R36
1
R35
82.5K
2
U3
LTC4441MS10
Sw0
A
Quick Start Guide
J2
Q1
PHM21NQ15T
R9
47
D
To Enable See
3
Vu1
G1
1
2
1
C10
0.1uF
R7
Opt.
Vu1
U1
LT1952EGN-1
+
CO1
CO2
CO5
(Opt.)
4
R6
Opt.
6
2
D1
BAS516
Q7
Q6
HAT2165
Q13,Q14 Are Optional
CSYS
470uF
6.3V
APXE
3
VCC
CG
CO3
CO4
100uF
6.3V
TDK
C2
1500pF
200V
C21
220pF
Vfb
R15
115K
Q4
Q5
HAT2165
2
1
Q8
(Opt.)
6
U2
LTC4440ES6-5
A
R14
33K
Q3
(Opt.)
Sw0
Vu2
R5
10
C3
1uF
16V
R13
22K
9
1
Vu1
Q12
BC857BF
6
2
TP4
C
8
+Vin
2
-Vin
1
TP1
J1
D3
BAS516
C1
Opt.
2
D5
PDZ9.1B
2
+Vout
+Vo1
6
1
Sw1
1
R4
Opt.
+3.3V at 40A
L1
.65uH
PA1382.650
5
2
4
1
4
1
T1
PA0369.003
4
R11
82K
Q11
Opt.
D2
BAS516
1
3
Q10
PZTA42
Isolation Boundary
2
1
D
1
1
CIN1
CIN2
CIN3
2.2uF
100V
TDK
3
1
TP3
CIN4
(Opt.)
L2
1.5mH
DO1607B-155ML-C
Vu1
4
2
2
+Vin
R2
0
+Vb
2
1
R1
2.2
3
+Vin
36V-72V
3
1
5
3
2
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
408-434-0507 FAX
Title
48Vin to 3.3Vout @ 40A Isolated DC/DC Converter
LT1952EGN-1, LTC3900CS8, LT4430ES6
Size
Document Number
Date:
Monday, October 03, 2005
Rev
Demo Circuit 830A
Sheet
1
1
of
1
A
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